* {
    margin: 0;
    padding: 0;
}

/*商办部分导航*/
.top {
    height: 50px;
    background-color: ghostwhite;
    display: flex;
    justify-content: space-around;
    align-items: center;
}

.top > div:last-child {
    cursor: pointer;
    background-color: yellow;
    height: 50px;
    line-height: 50px;
    padding: 0 20px;
}

/*左导航栏*/
.left {
    width: 200px;
    height: calc(100vh - 50px);
    background-color: rgb(50, 130, 130);
    text-align: center;

}

.left > div > div {
    width: 200px;


}

.left > div > div:hover {
    background-color: gray;
}
.left>div>div>div:nth-child(1){
    line-height: 50px;
    font-weight: bold;
}
.left>div>div>div:nth-child(2){
    text-indent: 2em;
    display: none;
}
.left>div>div>div:nth-child(2)>div:hover{
    background-color: gold;

}




/*右方内容栏*/
.right {
    width: calc(100vw - 200px);
    height: calc(100vh - 50px);
    background-color: gray;
    overflow: auto;
}

.top + div {
    display: flex;
}